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Placental Mammals

Are the living primates truly the most highly encephalized order among extant mammals This is partly a semantic issue, revolving around how one defines most highly encephalized. Stephan 1972 maintained that while high encephalization was obviously characteristic of Homo, it was just as clearly not uniformly true of the entire order. Martin 1973 , Radinsky 1970, 1975 , and others have also shown that primates are not unique in their high level of encephalization. There is considerable overlap...